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Make ScalarEvolution::forgetLoop forget all contained loops too, because

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they may have ValuesAtScopes map entries referencing their outer loops.
This fixes a user-after-free reported in PR8471.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117698 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-10-29 20:16:10 +00:00
parent fea34d38b4
commit e60dcb5e97
1 changed files with 5 additions and 0 deletions
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5
lib/Analysis/ScalarEvolution.cpp
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@ -3781,6 +3781,11 @@ void ScalarEvolution::forgetLoop(const Loop *L) {
PushDefUseChildren(I, Worklist);
}
// Forget all contained loops too, to avoid dangling entries in the
// ValuesAtScopes map.
for (Loop::iterator I = L->begin(), E = L->end(); I != E; ++I)
forgetLoop(*I);
}
/// forgetValue - This method should be called by the client when it has